Episodes
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Why and How to Test Heat Pump Defrost - Short #310
A small amount of frost is normal in heating mode; excessive frost becomes a problem because it restricts airflow and heat transfer.
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Building a Business That Lasts: Why Culture Beats Strategy in HVACR w/ Tony Gonzalez
Core values should describe behavior the company already practices, not merely an aspirational list, and leaders must reinforce them through recognition, one-on-ones, and development reviews.
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Tight Enough to Fail - Short #309
A screw that feels tight can still have poor electrical contact, increased resistance, and unwanted heating.
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Glycol Skids for Market Refrigeration w/ Max Johnson
Glycol secondary loop systems are mainly adopted to reduce refrigerant charge, improve safety, and comply with regulations, not primarily to increase efficiency.
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Your Thermostat Is Reading the Wall - Short #308
Thermostats are affected by radiant, convective, and conductive heat, so their readings can be distorted by external factors.
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Next-Gen Filtration - Pressure Drop, MERV 16, and Bypass Prevention w/ Chris Howells
A thicker filter is primarily about the surface area and face velocity, not just the media depth.
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The Fuse Only Blows When You Leave - Short #307
Always ask the customer what the system was doing right before the fuse blew, as this can offer valuable clues.
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Questionable CO Alarms w/ Bill Spohn
Standard UL 2034 alarms are designed to respond to immediate, high concentrations of carbon monoxide, but they can stay silent during long low-level exposures.
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Same Charge, Different Numbers - Short #306
Adjusting condenser airflow changes refrigerant system readings without changing the refrigerant charge.
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Tech, Mechanic, or Craftsman? Finding Your Fit in HVAC
Observing apprentices during various tasks reveals their interests and natural inclinations, which can guide appropriate role placement.
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Normal Subcooling, Hidden Restriction - Short #305
A restriction in the liquid line does not always lead to high subcooling; system responses can mask the restriction.
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Airflow Serenity w/ Alex Meaney
Uncomfortable rooms are often a sign of airflow problems, and trusting the homeowner’s comfort complaints is a useful starting point.
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Less Compressor, More Suction Pressure - Short #304
An increase in suction pressure during compressor unload is a normal response and typically not a sign of failure.
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Mastering Your Meter Advanced Functionality with Louise Kellar (UEi Test Instruments)
Advanced clamp meter features like low current accuracy, wattage, power factor, and microamp measurements greatly enhance diagnostic capabilities in HVAC work.
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Premature Coil Failure in Ductless Mini-Splits & VRF Equipment - Short #303
Premature coil failure in ductless mini-splits and VRF systems is often caused by environmental factors like corrosion due to chlorides, salt, and chemical off-gassing.
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Advanced Refrigerant Recovery: Best Practices for Diverse Systems and Environments
Recovery machines cannot pump straight liquid refrigerant; they are designed for saturated vapor.
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The A2L & Refrigerant Transition - Short #302
A2L refrigerant systems incorporate safety sensors and blower recirculation systems to manage flammability risks.
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Invented For Techs, by Techs: Inside Refrigeration Technologies' "The Lab"
Refrigeration Technologies was founded on a 'for techs by techs' philosophy, emphasizing practical, safe, and innovative HVACR products.
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The Ethics of IAQ – Testing vs. Remediation Conflicts - Short #301
Always ensure mold assessment and remediation are conducted by separate, licensed professionals to prevent conflicts of interest.
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Is 400 CFM per Ton Always Right? w/ Ty
The rule of 400 CFM per ton is a helpful starting point but should be adjusted based on specific system conditions, climate, and altitude.
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